Art fairs and alterna-rock music festivals operate in much the same way: The class of drugs may differ and designer duds are paired down a tad perhaps, but a few people get very rich and rather a lot get very ripped. At the two-day Coachella Valley Music and Art Festival, Apr. 29-30, 2006, over in Indio, Ca., real art was thin on the ground save for a selection of bizarre sculptures ranging from giant babies made of parachute silk to flame-throwing metal go-bots. We did, however, stumble across a British band, Art Brut, a quintet that takes its name from Jean Dubuffet.